Nightmare

AC 13

HP 68 (8d10 + 24)

Speed 60 ft., fly 90 ft. (hover), (hover)

Immunities Fire

Senses Passive Perception 11

Languages understands Abyssal, Common, and Infernal but can't speak

CR 3

Traits

Confer Fire Resistance. The nightmare can grant Resistance to Fire damage to a rider while it is on the nightmare.

Illumination. The nightmare sheds Bright Light in a 10-foot radius and Dim Light for an additional 10 feet.

Actions

Hooves. Melee Attack Roll: +6, reach 5 ft. Hit: 13 (2d8 + 4) Bludgeoning damage plus 10 (3d6) Fire damage.

Ethereal Stride. The nightmare and up to three willing creatures within 5 feet of it teleport to the Ethereal Plane from the Material Plane or vice versa.